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  • Structural evolution of graphene quantum dots during thermal decomposition of citric acid and the corresponding photoluminescence

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    Accepted Manuscript (AM)
    Author(s)
    Wang, Shujun
    Chen, Zhi-Gang
    Cole, Ivan
    Li, Qin
    Griffith University Author(s)
    Li, Qin
    Year published
    2015
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    Abstract
    The thermally decomposed citric acid (TDCA) possesses either excitation-dependent or excitation-independent fluorescence as well as different quantum yields with varying synthesis conditions (i.e. temperature and reaction duration). These photoluminescent (PL) properties were found to be mainly determined by the quantitative competition between the graphene quantum dots (GQDs, average size in the range 0.7-1 nm) and the large-inhomogeneously-sized particles. Thermal induced reduction of oxygen containing functionalities leads to an enhancing effect to the PL of GQDs. The study reveals the structural evolution of the GQDs ...
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    The thermally decomposed citric acid (TDCA) possesses either excitation-dependent or excitation-independent fluorescence as well as different quantum yields with varying synthesis conditions (i.e. temperature and reaction duration). These photoluminescent (PL) properties were found to be mainly determined by the quantitative competition between the graphene quantum dots (GQDs, average size in the range 0.7-1 nm) and the large-inhomogeneously-sized particles. Thermal induced reduction of oxygen containing functionalities leads to an enhancing effect to the PL of GQDs. The study reveals the structural evolution of the GQDs upon thermal treatment and attempts to establish their relationship to the PL property. The GQDs synthesized in this study are excellent sensing materials for trivalent iron cation with both notable selectivity and sensitivity.
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    Journal Title
    Carbon
    Volume
    82
    DOI
    https://doi.org/10.1016/j.carbon.2014.10.075
    Copyright Statement
    © 2014 Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (http://creativecommons.org/licenses/by-nc-nd/4.0/) which permits unrestricted, non-commercial use, distribution and reproduction in any medium, providing that the work is properly cited.
    Subject
    Physical sciences
    Chemical sciences
    Engineering
    Environmental nanotechnology and nanometrology
    Publication URI
    http://hdl.handle.net/10072/69171
    Collection
    • Journal articles

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